Observatory · observe first
Follow the allocation change
Matched S&P 500 members → sector → industry → sub-industry → company. Each step uses the same percentage points.
Historical time machine
Historical observation
20182026
1 · Sector
Weight and 12M allocation change
2 · Industry
Inside Real Estate
Telecom Tower REITs0.90%+0.16 ppHealth Care REITs0.37%+0.07 ppTimber REITs0.11%-0.06 ppIndustrial REITs0.27%+0.06 ppMulti-Family Residential REITs0.40%+0.04 ppRetail REITs0.55%+0.04 ppOffice REITs0.21%+0.02 ppHotel & Resort REITs0.08%-0.01 ppOther Specialized REITs0.05%-0.01 ppSelf-Storage REITs0.29%+0.00 ppReal Estate Services0.10%+0.00 ppData Center REITs0.34%+0.00 ppSingle-Family Residential REITs0.00%+0.00 pp
3 · Sub-industry
Inside Telecom Tower REITs
Telecom Tower REITs · weight
0.90%
Industry change · 12M
+0.16 pp
Telecom Tower REITs · contribution
+0.163 pp
Company participation
100%
of industry constituents above their 6M weight average
4 · Companies driving this sub-industry
Apr 2019 · sorted by absolute contribution to 12-month change
| Company | Country | Market cap | Universe weight | 3M contribution | 12M contribution | 12M price return | Above 6M weight average |
|---|---|---|---|---|---|---|---|
| American Tower → AMT | United States | $86.2bn | 0.480% | +0.229 pp | +0.111 pp | +46.3% | Yes |
| Crown Castle → CCI | United States | $52.3bn | 0.291% | +0.131 pp | +0.039 pp | +29.6% | Yes |
| SBA Communications → SBAC | United States | $22.9bn | 0.128% | +0.060 pp | +0.013 pp | +27.1% | Yes |
Company contributions use weights among matched S&P 500 members and add through each level without rescaling. Companies without matched shares and prices are omitted. These observations do not establish official index weights or actual fund flows.